package com.gzsxy.JUC.add;

import java.util.concurrent.CountDownLatch;

/**
 * 计数器
 */
public class CountDownLatchDemo {


    public static void main(String[] args) throws InterruptedException {
        //总数是6 必须要执行任务的时候，再使用
        CountDownLatch countDownLatch = new CountDownLatch(6);

        for (int i = 1; i <= 6; i++) {
            new Thread(() -> {
                System.out.println(Thread.currentThread().getName() + " GO out");
                countDownLatch.countDown();//数量-1
            }, String.valueOf(i)).start();

        }
        countDownLatch.await();//等待计数器归零，然后再向下执行

        System.out.println("close door");

    }
}
